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Re: memory issues redux [message #41576 is a reply to message #41575]

Tue, 16 November 2004 09:49

Paolo Grigis
Messages: 171
Registered: December 2003

Senior Member

Actually, you can put a smaller number of, say, floats in
an array than bytes

IDL> a=fltarr(1024L*1024*511) ;this is ok
IDL> a=fltarr(1024L*1024*512)
% Array has too many elements.
% Execution halted at: $MAIN$

So it looks like IDL internally adresses the memory in byte sized
units, indipendently from the type of data stored, and therefore
you can get up to 2 gigaelements for a byte array, but just 512
megaelements for a float array, 256 megaelements for a double
array etc.

Therefore the real limit for a single array is at 2GB, no matter
the array type.

Cheers,
Paolo

R.G.Stockwell wrote:
> Marc, Paolo,
> thanks for the responses.
>
> Wow, that is much much better ram management under linux.
>
> I'll be using complex arrays actually, so the "not enough elements"
> should not be a problem (in principle, who knows what goes on in
> the bowels of idl).
>
> Looks like the thing to do would be to dual boot my computer
> and move idl over to the linux part. (too bad, because I am a
> big fan of idlde under windows, and I'm not a emacs guy. But
> i guess a scientist's gotta do what a scientist's gotta do).
>
> thanks,
> bob
>
>

--
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Paolo Grigis
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Switzerland http://www.astro.phys.ethz.ch/
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[Message index]

		Re: memory issues redux By: R.G.Stockwell on Tue, 16 November 2004 15:23
		Re: memory issues redux By: Karl Schultz on Tue, 16 November 2004 14:51
		Re: memory issues redux By: R.G.Stockwell on Tue, 16 November 2004 11:06
		Re: memory issues redux By: Karl Schultz on Tue, 16 November 2004 10:33
		Re: memory issues redux By: R.G.Stockwell on Tue, 16 November 2004 10:08
		Re: memory issues redux By: David Fanning on Tue, 16 November 2004 09:50
		Re: memory issues redux By: Paolo Grigis on Tue, 16 November 2004 09:49
		Re: memory issues redux By: R.G.Stockwell on Tue, 16 November 2004 09:08
		Re: memory issues redux By: Paolo Grigis on Tue, 16 November 2004 03:11
		Re: memory issues redux By: marc schellens[1] on Mon, 15 November 2004 23:36
		Re: memory issues redux By: marc schellens[1] on Mon, 15 November 2004 23:33
		Re: memory issues redux - yay linux By: R.G.Stockwell on Thu, 18 November 2004 15:31

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